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"Endotherm and ectotherm vertebrates may process cognitive tasks in fundamentally different ways due to differences in brain organisation," the authors argued.

At rest, a bumblebee’s temperature varies, like that of a traditional ectotherm.

"Doesn't that suggest that there's an adaptive value in being either a good ectotherm or a good endotherm, but not in the middle?"

Warming an ectotherm from 15° Celsius to 20° C might not increase metabolic rate much, Dillon says.